Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7477049 | Method for controlling the quality of the coolant for fuel cell systems | Josef Sonntag, Hubert Urban | 2009-01-13 |
| 7057306 | Fuel cell and control unit in a detachable housing | Werner Belschner, Reinhold Blutbacher, Josef Sonntag | 2006-06-06 |
| 6830843 | Method for controlling the quality of the coolant for fuel cell systems | Josef Sonntag, Hubert Urban | 2004-12-14 |
| 6555260 | Fuel cell system having a fuel cell stack with integrated polarity reversal protection diode | Markus Aberle, Josef Sonntag | 2003-04-29 |
| 6531876 | Apparatus for voltage measurement | Johann Einhart, Josef Sonntag | 2003-03-11 |